CN115514433A - Detection method, suppression method, terminal and storage medium of local oscillator leakage signal - Google Patents
Detection method, suppression method, terminal and storage medium of local oscillator leakage signal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
- H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
- H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
- H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers
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Abstract
The embodiment of the invention discloses a detection method, a suppression method, a terminal and a storage medium of local oscillator leakage signals. The detection comprises the following steps: receiving a first radio frequency signal sent by a first AOU end; adjusting the radio frequency of a second radio frequency signal at the second AOU end so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is larger than a first preset threshold; and under the condition that the frequency difference is greater than a first preset threshold value, detecting a local oscillator leakage signal of the first radio frequency signal. Therefore, the local terminal can accurately detect the local oscillator leakage in the radio frequency signal of the opposite terminal, and the occurrence of misjudgment is avoided. The inhibition comprises: the MSE index demodulated by the local terminal is used for judging, whether the MSE index has an influence on real-time adjustment of a direct current component value superposed on a equidirectional orthogonal signal of a baseband unit of an opposite terminal complete machine is used for inhibiting local oscillator leakage of the opposite terminal, so that not only is a large amount of labor, resources and time saved, but also real-time monitoring can be realized, the final MSE index of point-to-point communication is used as a judgment standard, and the problems of misjudgment and failure can be effectively solved.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a detection method, a suppression method, a terminal and a storage medium of local oscillator leakage signals.
Background
Along with the development requirement of the large capacity of the 5G communication technology, for microwave backhaul, the transmission capacity requirement of a microwave AOU (All Outdoor Unit) model is higher and higher, the traditional method for improving the signal-to-noise ratio (such as changing the modulation mode and the like) can not meet the requirement far away, the transmission bandwidth can be well improved by adopting a zero intermediate frequency scheme, and further the transmission capacity is improved, in addition, an intermediate frequency local oscillation source circuit, an intermediate frequency mixer, an intermediate frequency SAW (surface acoustic wave) filter circuit and the like can be omitted by the zero intermediate frequency scheme, the complexity and the number of devices of a transmitter system are reduced, the system size, the weight, the power consumption and the cost are greatly reduced, and the requirements and the advantages lead to the wide application of the zero intermediate frequency scheme in a new generation of AOU model.
However, the greatest disadvantage of the zero intermediate frequency scheme is that serious local oscillator leakage is caused by imbalance of amplitudes and phases of the quadrature modulation signal and the quadrature local oscillator signal and sensitivity to direct current offset, and therefore, the suppression of useless local oscillator leakage signals is the key of the zero intermediate frequency scheme.
The effective premise of local oscillator leakage signal suppression is that the local oscillator leakage signal of the AOU at the opposite end can be detected or identified in the local end. However, in the existing local oscillator leakage signal suppression scheme, under the change of temperature, the phenomenon of misjudgment exists, so that error codes or broken chains are generated, and the local oscillator leakage signals cannot be effectively detected or identified.
Disclosure of Invention
The embodiment of the invention provides a detection method, a suppression method, a terminal and a medium of zero intermediate frequency local oscillator leakage signals. The problem of detection misjudgment can be effectively solved, the local oscillator leakage signal can be effectively restrained, and cost is greatly saved.
In a first aspect, an embodiment of the present invention provides a method for detecting a local oscillator leakage signal, which is applied to a second AOU terminal, where the method includes:
receiving a first radio frequency signal sent by a first AOU end;
adjusting the radio frequency of a second radio frequency signal at the second AOU end so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold;
and under the condition that the frequency difference is greater than the first preset threshold value, detecting a local oscillator leakage signal of the first radio frequency signal.
In a second aspect, an embodiment of the present invention provides a method for suppressing a local oscillator leakage signal, where based on the detection method in the first aspect of the present invention, the method for suppressing includes:
when the local oscillator leakage exists in the first radio frequency signal, calculating the MSE of the second AOU end;
and sending a feedback signal to the first AOU end under the condition that the MSE is smaller than a second preset threshold value, so that the first AOU end adjusts the value of the direct current component superposed on the orthorhombic signal.
In a third aspect, an embodiment of the present invention provides a method for detecting a local oscillator leakage signal, where the method is applied to a first AOU terminal, and the method includes:
sending a first radio frequency signal to a second AOU end so that the second AOU end adjusts the radio frequency of a second radio frequency signal of the second AOU end, so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold value, and detecting the local oscillator leakage signal of the first radio frequency signal under the condition that the frequency difference is greater than the first preset threshold value.
In a fourth aspect, an embodiment of the present invention provides a method for suppressing a local oscillator leakage signal, where based on the detection method in the third aspect of the present invention, the method for suppressing includes:
when a feedback signal sent by the second AOU end is received, adjusting a direct current component value superposed on an orthonormal signal according to the feedback signal, wherein the feedback signal is generated by the second AOU end according to a comparison result of the MSE of the second radio frequency signal and a second preset threshold after the local oscillator leakage of the first radio frequency signal is identified.
In a fifth aspect, an embodiment of the present invention provides a terminal, including:
the first signal receiving unit is used for receiving a first radio frequency signal sent by the first AOU end;
the first frequency adjusting unit is used for adjusting the radio frequency of a second radio frequency signal at a second AOU end so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold value;
and the first leakage detection unit is used for detecting the local oscillator leakage signal of the first radio frequency signal under the condition that the frequency difference is greater than the first preset threshold value.
In a sixth aspect, an embodiment of the present invention provides a terminal, including:
the second signal sending unit is used for sending a first radio frequency signal to the second AOU end so that the second AOU end adjusts the radio frequency of a second radio frequency signal of the second AOU end, so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold value, and the second AOU end detects the local oscillator leakage signal of the first radio frequency signal under the condition that the frequency difference is greater than the first preset threshold value.
In a seventh aspect, an embodiment of the present invention provides a terminal, including: the present invention relates to a method for detecting a zero intermediate frequency local oscillator leakage signal and/or a method for suppressing a zero intermediate frequency local oscillator leakage signal, and more particularly, to a method for detecting a zero intermediate frequency local oscillator leakage signal and a method for suppressing a zero intermediate frequency local oscillator leakage signal.
In an eighth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores computer-executable instructions for performing the method for detecting a zero intermediate frequency local oscillator leakage signal and/or the method for suppressing a zero intermediate frequency local oscillator leakage signal as described above.
The embodiment of the invention comprises the following steps: according to the embodiment of the invention, the frequency difference meeting the requirement is actively manufactured by actively adjusting the radio frequency of the radio frequency signal of the local terminal, so that the frequency difference value between the radio frequency signal of the local terminal and the radio frequency signal of the receiving opposite terminal is always larger than the threshold value, the local terminal can accurately detect the local oscillator leakage in the radio frequency signal of the opposite terminal, and the occurrence of misjudgment is avoided. In addition, compared with the existing scheme, the embodiment of the invention does not need to acquire IQ offset at high and low temperatures, thereby saving a great deal of manpower, resources and time; and the MSE index of the final point-to-point communication can be used as a judgment standard by real-time monitoring.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and do not constitute a limitation thereof.
Fig. 1 is a schematic structural diagram of a system for detecting a zero intermediate frequency local oscillator leakage signal according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a method for detecting a zero intermediate frequency local oscillator leakage signal applied to a second AOU end according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for suppressing a zero intermediate frequency local oscillator leakage signal applied to a second AOU end according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a method for detecting a zero intermediate frequency local oscillator leakage signal applied to a first AOU end according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a method for suppressing a zero intermediate frequency local oscillator leakage signal applied to a first AOU end according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a terminal according to another embodiment of the present invention;
fig. 8 is a schematic structural diagram of a terminal according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a terminal according to another embodiment of the present invention;
fig. 10 is a flow framework diagram of an OTA scheme provided by one embodiment of the present invention;
fig. 11 is a flowchart of a method for suppressing a zero intermediate frequency local oscillator leakage signal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
It is noted that while functional block divisions are provided in device diagrams and logical sequences are shown in flowcharts, in some cases, steps shown or described may be performed in sequences other than block divisions within devices or flowcharts. The terms "first," "second," and the like in the description, in the claims, or in the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Referring to fig. 1, a first embodiment of the present invention provides a zero intermediate frequency local oscillator leakage signal detection system for performing a method for detecting a zero intermediate frequency local oscillator leakage signal, where the system includes two AOU machines, i.e., an AOU1 machine (the step of this embodiment is represented by using a first AOU end) and an AOU2 machine (the step of this embodiment is represented by using a second AOU end), where signals of the AOU machines are transmitted in two directions. The radio frequency transmitting unit of the AOU1/AOU2 complete machine can transmit radio frequency signals to an opposite terminal, local oscillation signal leakage exists in the signals, and the nodes which generate technical problems are located.
Supposing that the AOU1 complete machine transmits a radio frequency signal, after receiving the signal, the AOU2 complete machine recognizes through the RX end of the AOU2, if the RX end recognizes that the radio frequency signal has local oscillator leakage, the operation of suppressing the local oscillator signal leakage can be performed, but if the RX end does not recognize, the AOU2 complete machine defaults that the local oscillator leakage signal of the AOU1 complete machine has been effectively suppressed, so that misjudgment occurs, the operation of suppressing the local oscillator signal leakage cannot be performed, which will cause a link to generate an error code, and the link is directly broken under a severe condition. Therefore, the effective premise of local oscillator leakage signal suppression is that local oscillator leakage signals of AOUs at opposite ends can be detected or identified in the local end, in a theoretical scene, the frequency of local oscillator leakage signals of the AOU1 complete machine received by an AOU2 complete machine and local oscillator LO signals of the AOU2 complete machine are the same frequency, but a frequency difference X actually exists, which is the key for the AOU2 complete machine to identify the local oscillator leakage signals of the AOU1 complete machine, and once the same frequency or the frequency difference of the two local oscillator leakage signals is smaller than a certain range X, the misjudgment can occur.
In order to solve the problem, referring to fig. 2, the system of this embodiment can execute a method for detecting a zero intermediate frequency local oscillator leakage signal, including the following steps:
and S101, the second AOU end receives a first radio frequency signal sent by the first AOU end.
Step S102, the second AOU end adjusts a radio frequency of a second radio frequency signal of the second AOU end, so that a frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold.
And step S103, under the condition that the frequency difference is larger than a first preset threshold value, the second AOU end detects the local oscillator leakage signal of the first radio frequency signal.
In the above step, the second AOU end receives the first radio frequency signal, and a local oscillator signal leakage exists in the signal (in the field, it cannot be completely avoided, and only the local oscillator signal leakage can be suppressed as much as possible), and the second AOU end needs to detect the signal. Before the detection is executed, the radio frequency of the second radio frequency signal of the second AOU end is actively adjusted, so that the frequency difference between the second radio frequency signal after the radio frequency adjustment and the first radio frequency signal can exceed
The first preset threshold value is set, so that under the condition of temperature change, the frequency difference between the two signals is always greater than the first preset threshold value, namely, the condition that the same frequency or the frequency difference of the two signals is less than a certain range X can not occur. And finally, the second AOU end detects the local oscillator leakage signal of the first radio frequency signal. It should be noted that: in the case of different AOU models, the value of the first preset threshold may be different, for example, the AOU model is usually selected to be 500Hz, but the embodiment is not limited thereto. It is also noted that: as shown in fig. 10, the detection of the local oscillator leakage signal at the AOU end is well known to those skilled in the art and will not be described in detail here.
In this embodiment, the frequency difference meeting the requirement is actively manufactured by actively adjusting the radio frequency of the radio frequency signal of the home terminal, so that the frequency difference between the radio frequency signal of the home terminal and the radio frequency signal of the receiving opposite terminal is always greater than the threshold, thereby avoiding the occurrence of misjudgment.
As shown in fig. 11, as an alternative embodiment, the main way for the second AOU end to adjust the rf frequency of the second rf signal at the second AOU end is: and adjusting the radio frequency mobile set frequency value of the second radio frequency signal at the radio frequency receiving end of the second AOU end. The second AOU terminal generally implements configuration of a register through software, and then moves the rf frequency of the second rf signal by a set frequency value through the configuration register. The design is realized through software, hardware does not need to be changed, and the cost is low.
Based on the above embodiment, the method further comprises the steps of:
and step S104, the second AOU terminal performs spectrum reduction on the radio frequency of the second radio frequency signal before baseband demodulation processing.
Since the rf frequency of the second rf signal is shifted in step S102, the spectrum needs to be shifted and restored, for example, if a is shifted, a needs to be restored to ensure normal demodulation of the second AOU end signal.
Referring to fig. 3, a second embodiment of the present invention provides a method for suppressing a zero intermediate frequency local oscillator leakage signal, including the following steps:
step S101, the second AOU end receives a first radio frequency signal sent by the first AOU end.
Step S102, the second AOU end adjusts a radio frequency of a second radio frequency signal of the second AOU end, so that a frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold.
And step S103, under the condition that the frequency difference is larger than a first preset threshold value, the second AOU end detects the local oscillator leakage signal of the first radio frequency signal.
And step S104, the second AOU end performs spectrum reduction on the radio frequency of the second radio frequency signal before baseband demodulation processing.
And S105, when the local oscillator leakage exists in the first radio frequency signal, the second AOU end calculates the MSE of the second AOU end.
And step S106, under the condition that the MSE is smaller than a second preset threshold, the second AOU end sends a feedback signal to the first AOU end so that the first AOU end adjusts the direct current component value superposed on the orthorhombic signal.
In steps S105 and S106, first, if the second AOU identifies that the local oscillator of the first radio frequency signal leaks, after the second AOU executes baseband demodulation, the MSE (Mean Square Error, where Chinese is a root-Mean-Square Error) performance of the local terminal is calculated, and when the MSE of the local terminal meets the requirement (i.e., is not less than a second preset threshold), it may be considered that the local oscillator of the first AOU is in a controllable range, and does not need to be processed, and the second AOU may operate normally. When the MSE of the local terminal does not meet the requirement (i.e. is smaller than a second preset threshold), the second AOU terminal sends a feedback signal to the first AOU terminal, and the purpose of sending the feedback signal is to enable the first AOU terminal to adjust a corresponding baseband signal so as to suppress local oscillator leakage of the first AOU terminal. In this embodiment, the second preset threshold may also be referred to as a demodulation threshold, and of course, the demodulation threshold is different for different AUO models or under different scenarios, which is a common knowledge of those skilled in the art and will not be described in detail herein. After receiving the feedback signal sent by the second AOU end, the first AOU end adjusts a direct current component value (referred to as IQ offset value for short) superimposed on the orthonormal signal of the baseband unit of the first AOU end, wherein the direct current component value superimposed on the orthonormal signal is automatically adjusted by the baseband unit, and the CPU controls the DAC to change the output voltage value.
The embodiment has the following technical effects:
1) Compared with the existing discrete parameter scheme (completing data acquisition and storage of direct current offset at high and low temperatures), the method does not need to acquire IQ offset at high and low temperatures, and saves a large amount of manpower, resources and time.
2) The method can be used for monitoring in real time, and the final MSE index of point-to-point communication is taken as a judgment standard.
3) The method can effectively solve the problems of misjudgment and failure.
Referring to fig. 4, a third embodiment of the present invention provides a method for detecting a zero intermediate frequency local oscillator leakage signal, including the following steps:
step S201, the first AOU end sends a first radio frequency signal to the second AOU end, so that the second AOU end adjusts a radio frequency of a second radio frequency signal of the second AOU end, so that a frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold, and the second AOU end performs local oscillator leakage signal detection on the first radio frequency signal under the condition that the frequency difference is greater than the first preset threshold.
In this embodiment, a frequency difference meeting the requirement is actively manufactured by actively adjusting the radio frequency of the radio frequency signal at the home terminal, so that the frequency difference between the radio frequency signal at the home terminal and the radio frequency signal at the receiving opposite terminal is always greater than a threshold value, thereby avoiding erroneous determination.
Referring to fig. 5, based on the third embodiment, a fourth embodiment of the present invention provides a method for suppressing a zero intermediate frequency local oscillator leakage signal, including the following steps:
step S201, the first AOU end sends a first radio frequency signal to the second AOU end, so that the second AOU end adjusts a radio frequency of a second radio frequency signal of the second AOU end, so that a frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold, and the second AOU end performs local oscillator leakage signal detection on the first radio frequency signal under the condition that the frequency difference is greater than the first preset threshold.
Step S202, when receiving a feedback signal sent by the second AOU end, the first AOU end adjusts a direct current component value superposed on the orthorhombic signal according to the feedback signal, wherein the feedback signal is generated by the second AOU end according to a comparison result of the MSE of the second radio frequency signal and a second preset threshold after the second AOU end recognizes that the local oscillator leakage exists in the first radio frequency signal.
For the principle part, please refer to the second embodiment, which is not described herein again, and this embodiment has the following technical effects:
1) Compared with the existing discrete parameter scheme (completing data acquisition and storage of direct current offset at high and low temperatures), the method does not need to acquire IQ offset at high and low temperatures, and saves a large amount of manpower, resources and time.
2) The method can be used for monitoring in real time, and the final MSE index of point-to-point communication is taken as a judgment standard.
3) The method can effectively solve the problems of misjudgment and failure.
Referring to fig. 6, a fifth embodiment of the present invention provides a terminal including: the first signal receiving unit, the first frequency adjusting unit and the first leakage detecting unit.
The first signal receiving unit is used for receiving a first radio frequency signal sent by the first AOU end;
the first frequency adjusting unit is used for adjusting the radio frequency of the second radio frequency signal at the second AOU end so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is larger than a first preset threshold value;
and the first leakage detection unit is used for detecting the local oscillator leakage signal of the first radio frequency signal under the condition that the frequency difference is greater than a first preset threshold value.
It should be noted that, since the terminal of this embodiment and the method in the first embodiment have the same technical principle and the same beneficial effects, the details are not repeated here to avoid the repetition of the contents.
Wherein, the first frequency adjustment unit is specifically configured to: and shifting the radio frequency of the second radio frequency signal by a set frequency value through a configuration register.
As an optional implementation manner, the mobile terminal further includes a first frequency reduction unit, where the first frequency reduction unit is configured to: after the first leakage detection unit detects the local oscillation leakage signal of the first radio frequency signal based on the frequency difference, the frequency spectrum of the second radio frequency signal with the mobile set frequency value is restored.
Referring to fig. 7, a sixth embodiment of the present invention provides a terminal based on the fifth embodiment, further including: the device comprises a first MSE calculation unit and a first signal transmission unit.
The first MSE calculating unit is used for calculating the MSE of the second AOU end when the local oscillator leakage exists in the first radio frequency signal;
the first signal sending unit is configured to send a feedback signal to the first AOU end when the MSE is smaller than a second preset threshold, so that the first AOU end adjusts a dc component value superimposed on the orthonormal signal.
It should be noted that, since the terminal in this embodiment and the method in the second embodiment have the same technical principle and the same beneficial effects, the details are not repeated here in order to avoid the repetition of the contents.
Referring to fig. 8, a seventh embodiment of the present invention provides a terminal including: the second signal sending unit is configured to send the first radio frequency signal to the second AOU end, so that the second AOU end adjusts a radio frequency of the second radio frequency signal at the second AOU end, so that a frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold, and the second AOU end performs local oscillator leakage signal detection on the first radio frequency signal under the condition that the frequency difference is greater than the first preset threshold.
It should be noted that, since the terminal of this embodiment and the method in the third embodiment have the same technical principle and the same beneficial effects, the details are not repeated here in order to avoid the repetition.
Referring to fig. 9, an eighth embodiment of the present invention provides a terminal based on the seventh embodiment, further including: a second signal receiving unit. And the second signal receiving unit is used for adjusting the value of a direct current component superposed on the orthonormal signal according to the feedback signal when receiving the feedback signal sent by the second AOU end, wherein the feedback signal is generated by the second AOU end according to the comparison result of the MSE of the second radio-frequency signal and a second preset threshold after identifying that the local oscillator leakage exists in the first radio-frequency signal.
It should be noted that, since the terminal in this embodiment and the method in the fourth embodiment have the same technical principle and the same beneficial effects, the details are not repeated here in order to avoid the repetition.
Referring to fig. 10 and fig. 11, a ninth embodiment of the present invention provides a system for suppressing a zero intermediate frequency local oscillator leakage signal, where the system executes a method for suppressing a zero intermediate frequency local oscillator leakage signal, and the system mainly includes two AOU machines, i.e., an AOU1 machine and an AOU2 machine, where the AOU1 machine at least includes an AOU1 radio frequency transmitting unit; an AOU1 radio frequency receiving unit; an AOU1 baseband transmitting unit; AOU1 baseband receiving unit. The AOU2 complete machine at least comprises an AOU2 radio frequency transmitting unit; an AOU2 radio frequency receiving unit; an AOU2 baseband transmitting unit; AOU2 baseband receiving unit.
Wherein the function of each unit is as follows:
AOU1/AOU2 radio frequency transmitting unit: the local oscillator signal is leaked by the unit, which is here the node where the problem occurs.
AOU1/AOU2 radio frequency receiving unit: the method is used for realizing frequency offset-A at a radio frequency end, and the size of the offset A is related to the stability of a selected frequency source.
AOU1/AOU2 baseband transmitting unit: the direct current component value superposed on the orthorhombic signal is automatically adjusted by the baseband transmitting unit and is realized by controlling the DAC to change the output voltage value through the CPU.
AOU1/AOU2 baseband receiving unit: and baseband demodulation, wherein the final performance MSE acquires a position for realizing the inverse compensation recovery + A of frequency offset at a baseband end before the baseband demodulation, so that the performance of the final baseband demodulation is not influenced by a frequency offset scheme.
As shown in fig. 10: after two AOU complete machines form a jump complete machine to normally work according to practical application, local oscillator leakage signals of AOU1 can be transmitted to a receiving end of AOU2 through a free space, the local oscillator leakage signals are amplified at the end of AOU2 through a radio frequency end and then transmitted to a baseband unit, the local oscillator leakage signals of AOU1 are identified after baseband detection, then after baseband demodulation, MSE of the AOU2 complete machine can be obtained, if the MSE does not meet requirements, the AOU2 can inform the baseband unit of AOU1 to adjust direct current component values superposed on homodromous orthogonal signals to reduce the size of the local oscillator leakage signals of AOU1, and whether the MSE of AOU2 reaches the optimal judgment standard for inhibiting the local oscillator leakage signals at the opposite end or not is used.
However, the effective premise of the scheme in fig. 10 is that the local oscillator leakage signal of AOU1 is to be detected or identified at the AOU2 end, if the local oscillator leakage signal of AOU1 is not detected or identified, the default AOU1 local oscillator leakage signal is already effectively suppressed, and AOU2 does not notify AOU1 to adjust the dc component value superimposed on the orthonormal signal, and at this time, misjudgment may occur, so that the local oscillator leakage signal of AOU1 is not effectively suppressed, an error code may be generated in a link, and a link may be directly broken under a severe condition.
Theoretically, the frequency of the AOU1 local oscillation leakage signal received by the AOU2 and the local oscillation LO signal at the AOU2 receiving end are the same frequency, but there is actually a frequency difference X, which is the key for the AOU2 to identify the AOU1 local oscillation leakage signal, and once the same frequency or the frequency difference between the two is smaller than a certain range X, the above misjudgment will occur.
Since the signals of the whole machine are transmitted in two directions, the same problem exists in the other direction.
As shown in fig. 11, in the present embodiment, a received radio frequency local oscillator LO signal is innovatively shifted by a certain frequency-a at a receiving end in a software configuration manner, and is staggered from a TX local oscillator leakage signal frequency of an opposite end, a frequency difference meeting requirements is artificially manufactured, then the TX local oscillator leakage signal of the opposite end can be identified by entering a baseband unit, a large closed loop triggers the baseband unit of the opposite end to adjust a dc component value superimposed on an orthonormal signal, before entering baseband demodulation, a frequency spectrum is shifted and restored by + a, that is, demodulation judgment is not affected, and the inhibition effect of the TX local oscillator leakage signal can still be judged by using MSE.
A tenth embodiment of the present invention provides a terminal, including: memory, a processor, and a computer program stored on the memory and executable on the processor.
The processor and memory may be connected by a bus or other means.
The memory, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs as well as non-transitory computer executable programs. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and these remote memories may be connected to the processor through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
It should be noted that the terminal in this embodiment may be applied to, for example, an AOU1 complete machine or an AOU2 complete machine in the embodiment shown in fig. 1, the terminal in this embodiment can form a part of a system architecture in the embodiment shown in fig. 1, and these embodiments all belong to the same inventive concept, so these embodiments have the same implementation principle and technical effect, and are not described in detail here.
The non-transitory software programs and instructions required to implement the information processing method of the above-described embodiment are stored in the memory, and when executed by the processor, perform the information processing method of the above-described embodiment, for example, the method steps S101 to S103 in fig. 2, the method steps S101 to S106 in fig. 3, the method step S201 in fig. 4, and the method steps S201 to S202 in fig. 5 described above.
The above described terminal embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Furthermore, an eleventh embodiment of the present invention provides a computer-readable storage medium, which stores computer-executable instructions, which are executed by a processor or a controller, for example, by a processor in the terminal embodiment, and can make the processor execute the information processing method in the above-described embodiment, for example, execute the above-described method steps S101 to S103 in fig. 2, method steps S101 to S106 in fig. 3, method step S201 in fig. 4, and method steps S201 to S202 in fig. 5.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.
Claims (12)
1. A method for detecting local oscillator leakage signals is applied to a second AOU end, and comprises the following steps:
receiving a first radio frequency signal sent by a first AOU end;
adjusting the radio frequency of a second radio frequency signal at the second AOU end so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold;
and under the condition that the frequency difference is greater than the first preset threshold value, detecting a local oscillator leakage signal of the first radio frequency signal.
2. The method according to claim 1, wherein the adjusting the rf frequency of the second rf signal at the second AOU end comprises:
and adjusting the radio frequency mobile set frequency value of the second radio frequency signal at the radio frequency receiving end of the second AOU end.
3. The detection method according to claim 1 or 2, wherein after the detecting the local oscillator leakage signal of the first radio frequency signal, the detection method further comprises:
and before the baseband demodulation processing, performing spectrum reduction on the radio frequency of the second radio frequency signal.
4. A method for suppressing local oscillator leakage signals is based on the detection method of any one of claims 1 to 3, and comprises the following steps:
when the local oscillator leakage exists in the first radio frequency signal, calculating the MSE of the second AOU end;
and sending a feedback signal to the first AOU end under the condition that the MSE is smaller than a second preset threshold value, so that the first AOU end adjusts the value of the direct current component superposed on the orthorhombic signal.
5. A method for detecting local oscillator leakage signals is applied to a first AOU end, and comprises the following steps:
sending a first radio frequency signal to a second AOU end so that the second AOU end adjusts the radio frequency of a second radio frequency signal of the second AOU end, so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold value, and detecting the local oscillator leakage signal of the first radio frequency signal under the condition that the frequency difference is greater than the first preset threshold value.
6. A suppression method of local oscillator leakage signals is based on the detection method of claim 5, and the suppression method comprises the following steps:
when a feedback signal sent by the second AOU end is received, adjusting a direct current component value superposed on the orthorhombic signal according to the feedback signal, wherein the feedback signal is generated by the second AOU end according to a comparison result of the MSE of the second radio frequency signal and a second preset threshold after the local oscillation leakage of the first radio frequency signal is identified.
7. A terminal, comprising:
the first signal receiving unit is used for receiving a first radio frequency signal sent by the first AOU end;
the first frequency adjusting unit is used for adjusting the radio frequency of a second radio frequency signal at a second AOU end so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold value;
and the first leakage detection unit is used for detecting the local oscillator leakage signal of the first radio frequency signal under the condition that the frequency difference is greater than the first preset threshold value.
8. The terminal of claim 7, further comprising:
the first MSE calculating unit is used for calculating the MSE of the second AOU end when the local oscillator leakage exists in the first radio frequency signal;
the first signal sending unit is configured to send a feedback signal to the first AOU end when the MSE is smaller than a second preset threshold, so that the first AOU end adjusts a dc component value superimposed on the orthonormal signal.
9. A terminal, comprising:
the second signal sending unit is used for sending a first radio frequency signal to the second AOU end so that the second AOU end adjusts the radio frequency of a second radio frequency signal of the second AOU end, so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than a first preset threshold value, and the second AOU end detects the local oscillator leakage signal of the first radio frequency signal under the condition that the frequency difference is greater than the first preset threshold value.
10. The terminal of claim 9, further comprising:
and the second signal receiving unit is configured to, when receiving a feedback signal sent by the second AOU end, adjust a direct current component value superimposed on an orthonormal signal according to the feedback signal, where the feedback signal is generated by the second AOU end according to a comparison result between the MSE of the second radio frequency signal and a second preset threshold after recognizing that the local oscillator leakage exists in the first radio frequency signal.
11. A terminal, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method for detecting the local oscillator leakage signal according to any one of claims 1 to 3 and 5 and/or the method for suppressing the local oscillator leakage signal according to any one of claims 4 and 6 when executing the computer program.
12. A computer-readable storage medium storing computer-executable instructions for performing the method for detecting a local oscillator leakage signal according to any one of claims 1 to 3 and 5 and/or the method for suppressing a local oscillator leakage signal according to any one of claims 4 and 6.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110694694.3A CN115514433A (en) | 2021-06-22 | 2021-06-22 | Detection method, suppression method, terminal and storage medium of local oscillator leakage signal |
| PCT/CN2022/095668 WO2022267823A1 (en) | 2021-06-22 | 2022-05-27 | Detection method and suppression method for local oscillator leakage signal, and terminal and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110694694.3A CN115514433A (en) | 2021-06-22 | 2021-06-22 | Detection method, suppression method, terminal and storage medium of local oscillator leakage signal |
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| CN115514433A true CN115514433A (en) | 2022-12-23 |
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| CN202110694694.3A Pending CN115514433A (en) | 2021-06-22 | 2021-06-22 | Detection method, suppression method, terminal and storage medium of local oscillator leakage signal |
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| Country | Link |
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| CN (1) | CN115514433A (en) |
| WO (1) | WO2022267823A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9787415B2 (en) * | 2013-03-14 | 2017-10-10 | Analog Devices, Inc. | Transmitter LO leakage calibration scheme using loopback circuitry |
| US10033514B2 (en) * | 2013-10-09 | 2018-07-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for preventing transmitter leakage |
| US10033427B2 (en) * | 2014-06-11 | 2018-07-24 | Texas Instruments Incorporated | Transmitter local oscillator leakage suppression |
| CN107547145B (en) * | 2016-06-27 | 2021-10-12 | 中兴通讯股份有限公司 | Method and device for detecting local oscillator leakage signal |
| CN108242940A (en) * | 2016-12-26 | 2018-07-03 | 中兴通讯股份有限公司 | A kind of device and method for eliminating local-oscillator leakage |
| CN109412708B (en) * | 2018-12-12 | 2024-04-09 | 中国电子科技集团公司第五十四研究所 | Local oscillator leakage detection circuit in radio frequency transceiver circuit |
-
2021
- 2021-06-22 CN CN202110694694.3A patent/CN115514433A/en active Pending
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- 2022-05-27 WO PCT/CN2022/095668 patent/WO2022267823A1/en unknown
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| WO2022267823A1 (en) | 2022-12-29 |
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